moving big files between drives (5GB mkv) for sdd i get ~500KB/s on others i have 10-20MB/s but not stable,
i start googling and i found about some bug in kernels regarding DMA but dont know how to check it , webmin is rejecting any changes on ide parameters tab, can some1 help to figure it out whats going on ? from windows environment i know that transfer between this kind of drives should be on lvl 50-70MB/s

first of all, which kernel do you use and which bug are you referring to?

Also have you try from LiveCD to benchmark with "hdparm -Tt" , and also what is the result of SMART on sdd

Code:

smartctl -d auto -a /dev/sdd

Transfers may vary from disk to disk, especially those new green powered or advanced format crappy ones, in addition to poor SATA controllers on some MB e.t.c. but despite the above your sdd is not acting normal, have you try to at least fsck it, to clear out the filesystem failure?

Hi Gerasimos, I've noticed my drive may be failing too. Is there a way to isolate those sectors or will it just keep degrading?

Hi,

do you have pending sectors too?
Can you post the smart information?

You can isolate sectors in a way, but you need to re partition your HDD drive...
You can use hiren's CD or any other recovery tech tools CD to scan entire HDD sector by sector, I also use HDD regenerator and check to see which sectors are bad...

Now if your bad sectors are only on the beginning or at the end or even sequential in the middle of the drive, you can create a partition on the good part of the disk and the important is to leave the bad sectors partitions unformatted (raw).
I have disks running this way for years, of course not for saving important stuff but they are working still...

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